On 2017-12-13 16:00:49 [+0200], Joonas Lahtinen wrote: > On Thu, 2017-11-30 at 16:19 +0100, Sebastian Andrzej Siewior wrote: > > The code has an ifdef and uses two functions to either init the bare > > spinlock or init it and set a lock-class. It is possible to do the same > > thing without an ifdef. > > With this patch (in debug case) we first use the "default" lock class > > which is later overwritten to the supplied one. Without lockdep the set > > name/class function vanishes. > > > > Reported-by: kbuild test robot <fengguang.wu@xxxxxxxxx> > > How exactly did kbuild test robot figure this out? I fixed it up for RT, then robot found a way to complain about it. Then I slapped myself for not submitting this patch in the first place. > At least according to the source there doesn't seem to be clarity about > what is the right thing to do, this being just one option. I don' think `ifdef CONFIG_DEBUG_SPINLOCK' is an option. Especially since the i915 driver here is the only user in tree doing this kind of thing. Then we have lockdep_set_class_and_name() (which I promote here). This looks like the official way of doing lockdep related things and it has even more than ten users in tree. > Regards, Joonas Sebastian _______________________________________________ dri-devel mailing list dri-devel@xxxxxxxxxxxxxxxxxxxxx https://lists.freedesktop.org/mailman/listinfo/dri-devel
